<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 
    <title> 设备管理后台</title>
	<script src="reqrcode.js"></script>
	<style>
video{width:100vw;height:100vh;}	</style>
</head>
<body >
 
        <div >
            <!-- 内容主体区域 -->
 
            <div >
                <video id="video" width="480" height="320" controls></video>
                </div>
            <div >
               <input type="button" id="capture" value="拍照"/>
            </div>
            <div  >
                 <canvas id="canvas" width="480" height="480"></canvas>
   </div>
 <script src="dist/umd/qrious.js"></script> 
 
        </div>
 
</body>
</html>
 
<script>
    window.onload = function () {
 
        //访问用户媒体设备的兼容方法
 
        function getUserMedia(constraints, success, error) {
 
            if (navigator.mediaDevices.getUserMedia) {
 
                //最新的标准API
 
                navigator.mediaDevices.getUserMedia(constraints).then(success).catch(error);
 
            } else if (navigator.webkitGetUserMedia) {
 
                //webkit核心浏览器
 
                navigator.webkitGetUserMedia(constraints, success, error)
 
            } else if (navigator.mozGetUserMedia) {
 
                //firfox浏览器
 
                navigator.mozGetUserMedia(constraints, success, error);
 
            } else if (navigator.getUserMedia) {
 
                //旧版API
 
                navigator.getUserMedia(constraints, success, error);
 
            }
 
        }
 
        /*
 
        var exArray = []; //存储设备源ID
 
        MediaStreamTrack.getSources(function (sourceInfos) {
 
        for (var i = 0; i != sourceInfos.length; ++i) {
 
        var sourceInfo = sourceInfos[i];
 
        //这里会遍历audio,video，所以要加以区分
 
        if (sourceInfo.kind === 'video') {
 
        exArray.push(sourceInfo.id);
 
        }
 
        }
 
        });
 
        */
 
 
 
        let video = document.getElementById('video');
 
        let canvas = document.getElementById('canvas');
 
        let context = canvas.getContext('2d');
 
 
 
        function success(stream) {
 
            //兼容webkit核心浏览器
 
            let CompatibleURL = window.URL || window.webkitURL;
 
            //将视频流设置为video元素的源
 
            //   console.log(stream);
 
 
 
            //video.src = CompatibleURL.createObjectURL(stream);
 
            video.srcObject = stream;
 
            video.play();
 
        }
 
 
 
        function error(error) {
 
            console.log(`访问用户媒体设备失败${error.name}, ${error.message}`);
 
        }
 
 
 
        if (navigator.mediaDevices.getUserMedia || navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia) {
 
            if (!navigator.mediaDevices || !navigator.mediaDevices.enumerateDevices) {
 
                console.log("enumerateDevices() not supported.");
 
                return;
 
            }
 
 
 
            // 列出摄像头和麦克风
 
            var exArray = [];
 
            navigator.mediaDevices.enumerateDevices()
 
                .then(function (devices) {
 
                    devices.forEach(function (device) {
 
                        //   console.log(device.kind + ": " + device.label +
 
                        //       " id = " + device.deviceId);
 
                        if (device.kind == "videoinput") {
 
                            //   alert(device.label);
 
                            exArray.push(device.deviceId);
 
                        }
 
                    });
 
 
 
                    var mediaOpts = { video: { width: 420, height: 120 } };
 
                    var mediaOpts =
 
                    {
 
                        video:
 
                        {
 
                            deviceId: { exact: exArray[1] }
 
                        }
 
                    };
 
                    //调用用户媒体设备, 访问摄像头
 
                    getUserMedia(mediaOpts, success, error);
 
                })
 
                .catch(function (err) {
 
                    console.log(err.name + ": " + err.message);
 
                });
 
        } else {
 
            alert('不支持访问用户媒体');
 
        }
 
        var img = new Image();
 
        document.getElementById('capture').addEventListener('click', function () {
		setInterval(function(){
            context.drawImage(video, 0, 0, 480, 320);
 
            var image_data = context.getImageData(0, 0, 480, 320);
            // var string = OCRAD(image_data.data);
 
            // string = _arrayBufferToBase64(image_data);
 
            var image = new Image();
            image.src = canvas.toDataURL("image/jpeg");
            // return image;
         console.log(canvas.toDataURL("image/jpeg"));// newfile[0]是通过input file上传的二维码图片文件
        qrcode.decode(canvas.toDataURL("image/jpeg"));
        qrcode.callback = function (imgMsg) {
		location.assign("https://192.168.1.109/callbackqr.html#"+imgMsg);
		alert(imgMsg);
		}
            //   alert(image.src);
 },1000);
        })
 
    }
 
 
</script>
